Wednesday, February24, 2021
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Marine Weather and Tides
Highland, MD

Version 3.4
NOTICE
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 6:45AMSunset 5:56PM Wednesday February 24, 2021 12:52 PM EST (17:52 UTC) Moonrise 2:59PMMoonset 5:20AM Illumination 95% Phase: Waxing Gibbous; Moon at 13 days in cycle
NOTE: Some of the data on this page has not been verified and should be used with that in mind. It may and occasionally will, be wrong. The tide reports are by xtide and are NOT FOR NAVIGATION.
Marine Forecasts
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ANZ538 Patapsco River Including Baltimore Harbor- 1248 Pm Est Wed Feb 24 2021
.small craft advisory in effect through Thursday morning...
This afternoon..S winds 10 kt with gusts to 20 kt. Waves 1 ft.
Tonight..W winds 10 kt. Gusts up to 25 kt. Waves 1 ft.
Thu..NW winds 5 to 10 kt. Gusts up to 25 kt in the morning. Waves 1 ft.
Thu night..NW winds 5 kt. Waves less than 1 ft.
Fri..NE winds 5 kt. Waves flat.
Fri night..SE winds 5 to 10 kt. Waves 1 ft. Rain likely.
Sat..W winds around 5 kt. Waves 1 ft or less. Rain likely through the day, then a chance of rain through the night.
Sun..W winds around 5 kt. Waves 1 ft or less. Rain likely.
ANZ500 1248 Pm Est Wed Feb 24 2021
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will move offshore today with a cold front passing through tonight. High pressure will return for Thursday into Friday, but low pressure may impact the waters later Friday into the weekend. Small craft advisories may be needed for portions of the waters tongiht into Thursday.


7 Day Forecast for Marine Location Near Highland, MD
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location: 39.24, -77     debug


Area Discussion for - Baltimore, MD/Washington
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FXUS61 KLWX 241448 AFDLWX

Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 948 AM EST Wed Feb 24 2021

SYNOPSIS. High pressure will gradually build in from the southwest today. A weak cold front will cross the area later this afternoon, with high pressure building back in Thursday. Another low pressure system may impact the region toward the end of the week.

NEAR TERM /THROUGH TONIGHT/.

A noticeable low level stable layer was present on the 12Z LWX sounding. Broken clouds were in place this morning but these clouds are breaking up and mostly clear skies are expected over the next few hours. As skies clear, increased mixing will lead to the eroding of the low level stable layer which will allow temperatures to rapidly jump up as warm air aloft is mixed to the surface.

..Previous Discussion

Calm to light and variable winds with temperatures ranging from the upper 20s to middle 30s across the region with mainly clear skies due to high pressure early this morning.

High pressure will build over the southeastern states today. Warmer air will be drawn into the area by gusty southwest winds, with most locations in the 50s to mid 60s. Low pressure will be crossing the Great Lakes, dragging a weak cold front toward the area by this evening. Clouds will increase, and rain showers will approach from the northwest. Most of the showers should fizzle out crossing the Appalachians due to limited moisture and forcing. Besides the Alleghenies, northern Maryland and eastern West Virginia will have the best chance for a brief shower or sprinkle during the early evening. Precipitation may end as some snow showers west of the Allegheny Front, but accumulations should be minimal.

SHORT TERM /THURSDAY THROUGH FRIDAY NIGHT/. Thursday will feature clearing skies and northwest winds ushering in cooler air as high pressure builds over the Mississippi Valley. However, temperatures will remain near or slightly above seasonable averages. Clouds will increase Thursday night ahead of a shortwave trough, but dry weather is expected.

A more active and unsettled pattern returns Friday through the weekend. An area of surface high pressure will reside to our north during the day Friday before gradually moving offshore Friday night. Multiple areas of low pressure will advance towards the region Friday afternoon and evening. This leads to the possibility of another CAD set up with a wintry mix at the onset of precip over the western highlands of our CWA.

LONG TERM /SATURDAY THROUGH TUESDAY/. On the synoptic-scale, the features controlling the weather will be as follows. A subtropical ridge remains fixed over the central to eastern Gulf of Mexico into early next week while a split in the jets is noted to its north and west. Mid-level heights remain on the higher end over the weekend, generally around 570-dm.

With a strong surface ridge moving off the coast into the Atlantic, return flow will commence ushering in southeasterly winds on Saturday morning before turning more westerly by the evening as a cold front sweeps through. Unsettled conditions are likely before the frontal passage with snow mixing in with rain during the morning hours. This would mainly impact the higher terrain. Continued warm advection will eventually shift precipitation to all rain later in the morning. Meager amounts are forecast, generally maximizing in the tenth to quarter inch range.

As the flow aloft turns more west-southwesterly in nature, the mentioned cold front gradually stalls south of the region on Sunday. Ample moisture advection occurring within the confluent flow across the Ozarks into the Tennessee/Ohio Valleys will bring precipitation back to the area for Sunday. The culprit is a series of perturbations in the flow, each providing an impetus for periods of rainfall. While the air mass is quite mild in nature, cannot rule out some snowflakes across the higher peaks. Sunday will likely be the wetter of the two weekend days.

The northern stream really begins to amplify on Monday with height falls crossing the Mid-Atlantic region by the evening. The 00Z GFS solutions remains the most aggressive with a deep surface low tracking through New England. This would bring a much more potent frontal passage on Monday evening. It does appear the stalled baroclinic zone over the weekend shifts farther south which moves the moisture gradient back toward southern Virginia. Thus, aside from some morning rainfall, the remainder of the day appears to be dry in the wake of the cold front. After a mild weekend and early start to the week, temperatures are expected to drop off by 5 to 10 degrees bringing conditions closer to climatology by Tuesday. Ensemble solutions differ beyond this period, but the upper pattern becomes quasi-zonal. This will maintain chances for precipitation with near average temperatures.

AVIATION /15Z WEDNESDAY THROUGH SUNDAY/.

VFR conditions are expected today. South/southwest wind gusts to 25 kts are possible this afternoon. A weak front this evening will shift winds to the northwest, but other than a brief sprinkle, dry conditions are expected. VFR continues Thursday with high pressure.

With a chance for rainfall during much of the weekend, some periods of sub-VFR conditions are likely, especially on Sunday. Winds are not particularly strong, but multiple directional shifts are possible.

MARINE. Wind gusts of 20 to 25 kt are expected to return out of the south ahead of a cold front this afternoon, and a few gusts to near gale forecast can't completely be ruled out over the upper tidal Potomac River and upper portion of the Bay.

A weak front this evening will shift winds to the northwest. A SCA may be needed for portions of the waters through Thursday morning before high pressure builds in and winds relax.

SCA conditions are not expected for the weekend but increasing northwesterly wind behind a cold front could bring enhanced marine winds on Monday.

LWX WATCHES/WARNINGS/ADVISORIES. DC . None. MD . None. VA . None. WV . None. MARINE . Small Craft Advisory until 11 AM EST Thursday for ANZ531>534- 537>543. Small Craft Advisory until 6 PM EST this evening for ANZ530- 535-536.

SYNOPSIS . KLW NEAR TERM . KLW/JMG SHORT TERM . KLW LONG TERM . BRO AVIATION . BRO/KLW/JMG MARINE . BRO/KLW


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
BLTM2 - 8574680 - Baltimore, MD 22 mi58 min SSE 7 G 12 49°F 38°F1017.3 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 25 mi58 min SSE 15 G 16 49°F 1017.6 hPa
FSNM2 25 mi58 min S 11 G 14 52°F 1017.2 hPa
WASD2 - 8594900 - Washington, DC 25 mi58 min S 11 G 15 53°F 38°F1018.6 hPa
APAM2 - 8575512 - Annapolis, MD 33 mi58 min SSE 7 G 16 49°F 37°F1018.2 hPa
BSLM2 - Chesapeake Bay, MD 35 mi82 min SW 11 51°F 1018 hPa37°F
CPVM2 37 mi58 min 43°F 34°F
TPLM2 - Thomas Point, MD 38 mi52 min SSE 21 G 23 43°F 37°F1019.2 hPa (-1.3)32°F
TCBM2 - 8573364 - Tolchester Beach, MD 40 mi58 min S 11 G 16 51°F 37°F1018.5 hPa

Wind History for Baltimore, MD
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Gaithersburg - Montgomery County Airport, MD10 mi56 minS 13 G 1710.00 miFair58°F27°F31%1019.3 hPa
Fort Meade / Tipton, MD16 mi57 minS 910.00 miFair57°F32°F39%1018.6 hPa
Baltimore, Baltimore-Washington International Airport, MD18 mi58 minS 9 G 1710.00 miPartly Cloudy58°F28°F32%1017.5 hPa
College Park Airport, MD18 mi57 minS 4 G 1410.00 miFair57°F22°F26%1017.9 hPa
Frederick Municipal Airport, MD23 mi65 minSSW 10 G 1910.00 miFair50°F32°F50%1016.9 hPa

Link to 5 minute data for KGAI

Wind History from GAI (wind in knots)
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W7CalmNE3W3SE4CalmCalmSE4CalmCalmSE5SE6SE3CalmSE7S6S9S13
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1 day agoS7S4S5SW5W7W4SW5SW3CalmN3SW3W3W9W6W5W7NW7CalmS4S4SW7SW9
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2 days ago33S3SE4S4SE3S6SE5SE6SE6SE8SE5S6SE8SE10
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Tide / Current Tables for Middle Branch, Baltimore Harbor, Maryland
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Middle Branch
Click for Map
Wed -- 04:20 AM EST     0.60 feet High Tide
Wed -- 05:18 AM EST     Moonset
Wed -- 06:46 AM EST     Sunrise
Wed -- 10:30 AM EST     -0.17 feet Low Tide
Wed -- 02:57 PM EST     Moonrise
Wed -- 05:15 PM EST     1.05 feet High Tide
Wed -- 05:53 PM EST     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.10.20.40.50.60.60.50.30.1-0.1-0.2-0.2-00.20.50.81110.90.70.50.30.2

Tide / Current Tables for Chain Bridge, D.C.
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Chain Bridge
Click for Map
Wed -- 12:35 AM EST     0.22 feet Low Tide
Wed -- 05:19 AM EST     Moonset
Wed -- 06:16 AM EST     2.52 feet High Tide
Wed -- 06:47 AM EST     Sunrise
Wed -- 12:29 PM EST     0.16 feet Low Tide
Wed -- 03:00 PM EST     Moonrise
Wed -- 05:56 PM EST     Sunset
Wed -- 06:26 PM EST     2.84 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.30.30.61.31.92.32.52.421.40.80.40.20.20.51.222.62.82.82.41.91.30.8

Weather Map
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The information on this web site has not been checked for accuracy. It is for entertainment purposes only and should be independently verified before using for any other reason. There are five sources. 1) Documents and manuals from a variety of sources. These have not been checked for accuracy and in many cases have not even been read by anyone associated with L-36.com. I have no idea of they are useful or accurate, I leave that to the reader. 2) Articles others have written and submitted. If you have questions on these, please contact the author. 3) Articles that represent my personal opinions. These are intended to promote thought and for entertainment. These are not intended to be fact, they are my opinions. 4) Small programs that generate result presented on a web page. Like any computer program, these may and in some cases do have errors. Almost all of these also make simplifying assumptions so they are not totally accurate even if there are no errors. Please verify all results. 5) Weather information is from numerous of sources and is presented automatically. It is not checked for accuracy either by anyone at L-36.com or by the source which is typically the US Government. See the NOAA web site for their disclaimer. Finally, tide and current data on this site is from 2007 and 2008 data bases, which may contain even older data. Changes in harbors due to building or dredging change tides and currents and for that reason many of the locations presented are no longer supported by newer data bases. For example, there is very little tidal current data in newer data bases so current data is likely wrong to some extent. This data is NOT FOR NAVIGATION. See the XTide disclaimer for details. In addition, tide and current are influenced by storms, river flow, and other factors beyond the ability of any predictive program.